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1µA IQ, 250mA Low-Dropout Linear Regulator

EVB_RT9073A-33GQZ

The RT9073A is a low quiescent current linear regulator designed especially for low external components system. The input voltage range is from 1.2V to 5.5V. The RT9073A builds in a P-MOSFET output transistor which provides a low switch-on resistance for low dropout voltage applications.
The Error Amplifier compares the internal reference voltage with the output feedback voltage from the internal divider, and controls the Gate voltage of P-MOSFET to support good line regulation and load regulation at output voltage.

Purpose

The RT9073A is a low-dropout (LDO) voltage regulators with enable function that operates from 1.2V to 5.5V. It provides up to 250mA of output current and offers low-power operation in miniaturized packaging.

The features of low quiescent current as low as 1µA and almost zero disable current is ideal for powering the battery equipment to a longer service life. The RT9073A is stable with the ceramic output capacitor over its wide input range from 1.2V to 5.5V and the entire range of output load current (0mA to 250mA).

Introduction

General Product Information

The RT9073A is a low quiescent current linear regulator designed especially for low external components system. The input voltage range is from 1.2V to 5.5V. The RT9073A builds in a P-MOSFET output transistor which provides a low switch-on resistance for low dropout voltage applications.

The Error Amplifier compares the internal reference voltage with the output feedback voltage from the internal divider, and controls the Gate voltage of P-MOSFET to support good line regulation and load regulation at output voltage.

Product Feature

1µA Ground Current at no Load

PSRR = 75dB at 1kHz

Adjustable Output Voltage Available by Specific Application

±2% Output Accuracy

250mA (VIN ≥ 2.3V) Output Current with EN

Low (0.1µA) Disable Current

1.2V to 5.5V Operating Input Voltage

Dropout Voltage : 0.5V at 250mA when VOUT ≥ 3V

Support Fixed Output Voltage 3.3V

Stable with Ceramic or Tantalum Capacitor

Current Limit Protection

Over Temperature Protection

ZQFN-4L 1x1 Packages Available

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB045_V1

Input Voltage Range

1.2V to 5.5V

Output Current Limit

350mA

Power Supply Rejection Ratio

75dB

Default Marking & Package Type

RT9073A-33GQZ, ZQFN-4L 1x1

VCC Consumption Current

1µA

Bench Test Setup Conditions

Headers Description and Placement

Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to evb_service@richtek.com

Test Points

The EVB is provided with the test points and pin names listed in the table below.

The RT9073A is a low-dropout (LDO) voltage regulators with enable function that operates from 1.2V to 5.5V. It provides up to 250mA of output current and offers low-power operation in miniaturized packaging.

The features of low quiescent current as low as 1μA and almost zero disable current is ideal for powering the battery equipment to a longer service life. The RT9073A is stable with the ceramic output capacitor over its wide input range from 1.2V to 5.5V and the entire range of output load current (0mA to 250mA).